6545881 has 2 divisors, whose sum is σ = 6545882. Its totient is φ = 6545880.

The previous prime is 6545879. The next prime is 6545887. The reversal of 6545881 is 1885456.

It is the 1045-th star number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3686400 + 2859481 = 1920^2 + 1691^2 .

It is a cyclic number.

It is not a de Polignac number, because 6545881 - 2¹ = 6545879 is a prime.

It is a super-2 number, since 2×6545881² = 85697116132322, which contains 22 as substring.

Together with 6545879, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 6545881.

It is not a weakly prime, because it can be changed into another prime (6545887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3272940 + 3272941.

It is an arithmetic number, because the mean of its divisors is an integer number (3272941).

Almost surely, 2^6545881 is an apocalyptic number.

It is an amenable number.

6545881 is a deficient number, since it is larger than the sum of its proper divisors (1).

6545881 is an equidigital number, since it uses as much as digits as its factorization.

6545881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38400, while the sum is 37.

The square root of 6545881 is about 2558.4919386232. The cubic root of 6545881 is about 187.0636347245.

The spelling of 6545881 in words is "six million, five hundred forty-five thousand, eight hundred eighty-one".